| Acronym | Definition |
|---|
| RTA | Rapid Transit Authority |
| RTA | Ready-To-Assemble (product) |
| RTA | Regional Transit Authority |
| RTA | Regional Transportation Authority (Chicago, IL, USA) |
| RTA | Restricted To Adults |
| RTA | Greater Cleveland Regional Transit Authority |
| RTA | Road Traffic Accident |
| RTA | Reply to All (email) |
| RTA | Royal Tongan Airlines |
| RTA | Roads and Traffic Authority (Australia) |
| RTA | Return to Australia |
| RTA | Rewriting Techniques and Applications |
| RTA | Residential Tenancies Act (various locations) |
| RTA | Real Time Analyzer |
| RTA | Registered Training Organisation (Australia) |
| RTA | Renal Tubular Acidosis |
| RTA | Residential Tenancies Authority (Australia) |
| RTA | Relaxation Time Approximation (statistical mechanics) |
| RTA | Road to Avonlea |
| RTA | Real-Time Access (software) |
| RTA | Read the Article |
| RTA | Road Traffic Act (Northern Ireland) |
| RTA | Run Time Analysis |
| RTA | Real Time Data Acquisition |
| RTA | Real Time Access |
| RTA | Returning to Application |
| RTA | Reply to All |
| RTA | Real Time Agent |
| RTA | Run Time Application |
| RTA | Response Time Analyzer |
| RTA | Run Time Access |
| RTA | Response Time Accelerator |
| RTA | Repeat to Address |
| RTA | Real Time Architect |
| RTA | Rapid Thermal Annealing |
| RTA | Rio Tinto Aluminium (various locations) |
| RTA | Race Team Alliance |
| RTA | Royal Thai Army |
| RTA | Referring Travel Agent |
| RTA | Regional Trade Agreement |
| RTA | Return to Agency |
| RTA | Revue Technique Automobile (French: Automotive Technology Magazine) |
| RTA | Retired Teachers Association |
| RTA | Railway Tie Association |
| RTA | Registrar/Transfer Agent |
| RTA | Radio Television Afghanistan |
| RTA | Road & Traffic Authority |
| RTA | Real Time Accounting |
| RTA | Research Technical Assistance |
| RTA | Resident Twinning Advisor |
| RTA | Required Time of Arrival |
| RTA | Resort Travel Agency |
| RTA | Research and Technology Agency (NATO) |
| RTA | Road Transport Association |
| RTA | Recognised Testing Authority (telecommunications; National Association of Testing Authorities; Australia) |
| RTA | Read to Achieve |
| RTA | Real-Time Adjudication (health care claims) |
| RTA | Regional Trading Arrangement |
| RTA | Riverside Transit Authority |
| RTA | Rochester Teachers Association (Rochester, NY) |
| RTA | RoadTrip America |
| RTA | Response Time Analysis |
| RTA | Remember the Alamo |
| RTA | Rapid Type Analysis |
| RTA | Receiver-Transmitter Antenna |
| RTA | Remote Trunk Arrangement |
| RTA | Ricin Toxin A |
| RTA | Remix Technology Award |
| RTA | Russell Trust Association (aka Yale's Skull and Bones Society) |
| RTA | Rail Tours Austria |
| RTA | Roads and Transportation Authority (United Arab Emirates) |
| RTA | Radio-Télévision Algérienne (Algeria) |
| RTA | Records & Tax Administration (Olathe, KS) |
| RTA | Revolutionary Turbine Accelerator |
| RTA | Ragnarok: the Animation (game) |
| RTA | Régie des Transports de l'Aisne (French: Transport Authority of Aisne; Aisne, France) |
| RTA | Retention 'Til Access (memory access technology) |
| RTA | Round Trip Average (computer data transfer speed) |
| RTA | Ready-To-Advertise |
| RTA | Rotor Test Apparatus |
| RTA | Restructuring The Army |
| RTA | Réseau Transnational Atlantique (French: Atlantic Transnational Network) |
| RTA | Recommendation to Award |
| RTA | Range & Training Area (USMC) |
| RTA | Return to Archive |
| RTA | Related Technical Activities |
| RTA | Resident Technical Assistant (various universities) |
| RTA | Residual Threat Assessment |
| RTA | Right Torsion of the Abomasum |
| RTA | Responsible Test Agency |
| RTA | Retired Troopers Association |
| RTA | Remote to AFOS |
| RTA | Runestone Telephone Association |
| RTA | Risk Task Assessment (Health, Safety and Environmental Codes of Practice) |
| RTA | Regional Trade Associations/Alliances |
| RTA | Regional Transportation Alignment (merchandising) |
| RTA | Ray-Tracing Approach |
| RTA | Reusable Testing Assets |
| RTA | Receiver Transmitter Assembly |
| RTA | Random Task Arrival |
| RTA | Recreation Therapy Assistant |
| RTA | Revised Time of Arrival |
| RTA | Requirements Traceability Analysis |
| RTA | Reverse Transfer Arc |
| RTA | Recovery Time Achievable |